Linear oscillator for proximity sensor

Details Linear oscillator for proximity sensor Linear oscillator for proximity sensor

1975-05-12

1977-01-04

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

324 34PS, 324 34GT, 331117R, 331186, 340258C, G01R 3312, G08C 2100

Patent

active

040017184

ABSTRACT:
A proximity sensor oscillator, having a resonant circuit in which the power loss is inversely related to the distance of a conductive body from a probe containing a part of the resonant circuit, produces an oscillating output signal in the resonant circuit with a peak amplitude that varies with power loss and distance. A power source provides either the current or the voltage component of electrical power at a substantially constant value independent of changes of resonant circuit power loss and is periodically switched to the resonant circuit to provide an average input power thereto. The power loss of the resonant circuit loads the source, and thus the other component of power oscillates within the resonant circuit at a peak amplitude linearly related to the inverse of the power loss. A control circuit is responsive to the phase of the oscillating component to maximize power input to the resonant circuit by applying the fixed power component substantially only throughout each alternate half wave of the oscillating component having the same polarity sense as the one component. Over the operating range where the inverse of the power loss has a linear variation with distance, the peak amplitude of the oscillating component varies linearly with distance. A detector circuit responsive to the amplitude of the oscillating component provides an indication of distance.

REFERENCES:
patent: 2883538 (1959-04-01), Elam
patent: 3609580 (1971-09-01), Thompson et al.
patent: 3743853 (1973-07-01), Dittman et al.
National Semiconductor Linear Integrated Circuits Manual 1973, pp. 2-173.

Affiliated with

Also associated with

Rating

Linear oscillator for proximity sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear oscillator for proximity sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear oscillator for proximity sensor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-258039